When the sun shines through a window the room heats up and this is referred to as Solar Factor, which will provide a measure of free winter heating. This Solar Factor also increases the Window Energy Ratings. Slimlite also increases the Window Energy Ratings.
Slimlite Ultra Clear Self Cleaning Double Glazed Units has a high Light Transmission of 85% and therefore a high Solar Factor of 79% which is added free heating in the winter. A double glazed unit incorporating a Laminated glass it will reduce ultra violet by 98%, if there is a concern about furnishings.